Mechanical keyboard keycap material guide

I am creating a mechanical keyboard best keycap materials guide. I've already written 700 words so will send you my current article to build on. I need you to write about 3 more subtopics (I will send you them) and also expand on what i've already written. I will also ask that you try to incorporate relevant SEO keywords with low competition (the topics are based on these but it is good to cover more phrases.
The target total wordcount will be about 2500 so will need to write about 2000 words in addition to what I've already got.